I think, the best way to LEARN is to have a LOOK at other peoples work and to compare different approaches to the same subject! And the best way to 'criticize' and support is to give some positive feedback, to ENCOURAGE people (and not to depict what in your eyes might be wrong with the image, like bad teachers do in front of the class). Of course, if you prefer to discourage people, tell them what you would have done better! If you can't help it, why not do it via IM! - I mean, I do not speak of the forum, but of the gallery. If somebody feels she/he needs advice, help criticism she/he can post the image in the forum!